Audio, for gaming ... Zalman surround headphones, otherwise Yamaha MST50 2.1ch speakers for music.
Number of Monitors, it was 2, up to today, however, I got a 27inch LCD 720P HDTV with DVI that I'm now using as my main monitor (World of Warcraft looks Awesome on it) ...
I still need to pick up a cheapo PCI vidcard to hook up the third monitor, Currently it's the LCD at 1280x768 and one 19inch CRT at 1600x1200. (though there's also another CRT on my desk connected to my linux box / server running at 1600x1200, I use it for IRC and cruising the web as well as all my development and scripting.)
I currently only own 4 boxes, as that's really all I need.
I do not use IE ever.
I do not have any boxes on XP. (running win2k on my main gaming rig)